Race condition in Linux kernel - CVE-2026-31456
Published: April 24, 2026
Vulnerability identifier: #VU127693
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31456
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in walk_pmd_range() when walking page tables during concurrent PUD splitting and refault handling. A local user can trigger concurrent memory-management operations to cause a denial of service.
An example scenario involves reading numa_maps of a process while VFIO-PCI is setting up DMA on a large BAR for that process.
How to mitigate CVE-2026-31456
Install security update from vendor's repository.